I think the options are:
A. you can safely lose 10 pounds of fat in one week.
Bto lose weight, a person must take in fewer calories than that person uses.
Csome foods absorb calories and thereby hasten weight loss.
Dits possible to lose 40 pounds of fat in one weekend of diet and exercise
and the correct answer is B: in order to loose weight, you need to intake less calories than you use. 10 pounds (or 40...) is not healthy, about 2-3 pounds per week are considered healthy.